Glycine-Sodium Hydroxide Solution as an Attractant for Walnut Husk Fly1

Abstract
A solution of 2.25% glycine-3% sodium hydroxide, aged in the absence of walnut husk flies (Rhagoletis completa Cresson), rapidly increases in attractive power to this species during the first 2 weeks. From 2 to at least 7 weeks, and probably longer, this solution maintains a steady level of high attractant value. The optimum use of this bait solution in obtaining an index of fly populations in experiments involving area control of adults, and its current use in timing of the first spray for walnut husk fly control, are discussed.

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